Bivariate distributions

Worked examples (9)

• 1Naming the correlation from a description
• 2Reading correlation straight from a table
• 3Recognising no correlation
• 4Describing the correlation in the apricot data
• 5Strength is not steepness
• 6Turning a label into an interpretation
• 7Answering a claim about cause
• 8When a hidden group changes the description
• 9A full correlation question, start to finish

Model answers (9)

• ✓Model answer — 0479 Paper 1 style — 11.2
• ✓Model answer — 0479 Paper 2 style — 11.2
• ✓Model answer — 0479 Paper 1 style — 11.2
• ✓Model answer — 0479 specimen Paper 1 Q8 — 11.2
• ✓Model answer — 0479 specimen Paper 1 Q8(c)(i) — 11.2
• ✓Model answer — 0479 Paper 2 style — 11.2 (AO2)
• ✓Model answer — 0479 Paper 2 style — 11.2 (AO2)
• ✓Model answer — 0479 Paper 1 style — 11.2 (AO2)
• ✓Model answer — 0479 Paper 1 style — 11.2 (AO1 and AO2)

Worked examples (9)

• 1Naming the variables in the apricot data
• 2Choosing the roles in four contexts
• 3Labelling the axes before plotting
• 4Spotting a transposed scatter diagram
• 5Sorting by the right variable
• 6Reading the gradient as a sentence
• 7Estimating in both directions from the same diagram
• 8When neither variable controls the other
• 9Choosing two variables from three

Model answers (9)

• ✓Model answer — 0479 specimen Paper 1 Q8 style — 11.1
• ✓Model answer — 0479 Paper 1 style — 11.1, 11.3
• ✓Model answer — 0479 Paper 2 style — 11.1 (links to 12.1)
• ✓Model answer — 0479 specimen Paper 1 Q8(a) — 11.1, 11.3
• ✓Model answer — 0479 specimen Paper 1 Q8(b)(i) — 11.1, 11.4
• ✓Model answer — 0479 specimen Paper 1 Q8(b)(ii) style — 11.1, 11.5
• ✓Model answer — 0479 specimen Paper 1 Q8(c)(iii) and 8(d) — 11.1, 11.6
• ✓Model answer — 0479 Paper 2 style — 11.1 (AO2)
• ✓Model answer — 0479 Paper 1 style — 11.1 (AO1 and AO2)

Worked examples (9)

• 1Writing down the points to plot
• 2Working out what one small square is worth
• 3Choosing a scale for a blank grid
• 4Plotting and then checking the plot
• 5Reading information back off a finished diagram
• 6Finding the errors in a plotted diagram
• 7How one misplaced cross damages the whole question
• 8Plotting two groups on one diagram
• 9A complete plotting question

Model answers (9)

• ✓Model answer — 0479 specimen Paper 1 Q8(a) — 11.3
• ✓Model answer — 0479 Paper 2 style — 11.3
• ✓Model answer — 0479 Paper 1 style — 11.3
• ✓Model answer — 0479 specimen Paper 1 Q8(a) — 11.3
• ✓Model answer — 0479 specimen Paper 1 Q8(a) — 11.3
• ✓Model answer — 0479 Paper 1 style — 11.3
• ✓Model answer — 0479 Paper 2 style — 11.3
• ✓Model answer — 0479 Paper 1 style — 11.3 (AO2)
• ✓Model answer — 0479 Paper 2 style — 11.3 (AO1 and AO2)

Worked examples (9)

• 1Finding a semi-average point
• 2Finding the equation without plotting
• 3Drawing the line by eye
• 4Checking the equation against the mean point
• 5Estimating from the equation and from the graph
• 6Estimating backwards, with a conversion first
• 7Judging an estimate: inside or outside the data
• 8Two different lines from the same data
• 9A complete bivariate question from start to finish

Model answers (9)

• ✓Model answer — 0479 specimen Paper 1 Q8(b)(i) — 11.4
• ✓Model answer — 0479 specimen Paper 1 Q8(b)(ii) — 11.5
• ✓Model answer — 0479 specimen Paper 1 Q8(c)(ii) — 11.4
• ✓Model answer — 0479 Paper 2 style — 11.5
• ✓Model answer — 0479 specimen Paper 1 Q8(c)(iii) style — 11.6
• ✓Model answer — 0479 specimen Paper 1 Q8(d) — 11.6
• ✓Model answer — 0479 Paper 1 style — 11.7 (AO2)
• ✓Model answer — 0479 Paper 2 style — 11.5, 11.7 (AO2)
• ✓Model answer — 0479 Paper 2 style — 11.4–11.7